Android Question Can't see panel

[Nitin Joshi]

I have created one small project. Main window has 4 buttons to open particular design. When any one button is clicked, I am loading "Run_Activity" and loading respective design on pnlMain. I want to see pnlMain when "Run_Activity" is loaded but can not see.
Note: pnlMain has black border with width 10 so that I can come to know how pnlMain is placed.
pnlDS1, pnlDS2, pnlDS3, pnlDS4 are kept invisible as i want to see pnlMain border.

Please help.

Sample project is attached.

 

[DonManfred]

All the main panels in the layouts are set to Visible = false